Go to the Smithsonian Eruption, Earthquakes & Emissions viewer at: http://volcan

Question

Go to the Smithsonian Eruption, Earthquakes & Emissions viewer at: http://volcano.si.edu/E3 Click on the viewer. View the time lapse animation showing earthquake and volcanic activity since 1960, and sulfur dioxide emissions (from volcanoes) since 1978. The size of the icons is relative to the magnitude of the event (e.g. a large orange triangle represents a relatively large volcanic event). Compare the relative magnitude of earthquakes and volcanic eruptions at each of the areas you explored in parts 2-4 (California transform, Juan de Fuca Ridge, East African Rift, Mount Ranier - as well as other plate boundaries of each time (such as Mid-Atlantic Ridge or the western Pacific plate where it meets China). Pause the animation as needed to explore the relative magnitude of earthquakes and volcanic eruptions at the different plate boundary types, then complete the Table below. In each cell, write Large, Medium, or Small to represent the relative size at each plate boundary (PB). "Relative" is in comparison to activity at other PB types. Volcanism Earthquakes Transform PB Submarine divergent PB Continental divergent Convergent PB PB

Explanation / Answer

transform plate boundary :

volcanism : small , earthquake : large

submarine divergent plate boundary : which is also called mid oceanic ridges

volcanism: medium , the rate of volcanism is controlled by rate of plate motion.

earthquake: small , shallow earthquake activities.

continental divergent boundaries:

volcanism: medium

earthquake : medium

convergent plate boundary

volcanism : large , both continental and island arc gives voluminous volcanic activity.

earthquakes: large , more deep seated earthquakes.

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